Apparatus for feeding powder to a stream of water



Nov.-24, 1931. H. BURMEIS'TER 1, 3

' APPARATUS FOR FEEDING- POWDER TO ASTREAM or: WATER Filed Jan. 5. 1929 v INVENTOR H/ws fiURMi-ISTER Patents TENT oF mE BORATION, A CORPORATION OF DELAWARE 53138 FOR, EEEDINGPQWDER.TO A. STREAM- OF WATER Application filed January 8, 1929, Serial No. 330,126, and in Gei-many May 11, 1928.

The present invention relates to fire fighti r ing apparatus and more particularly to apparatus for adding chemicals to a stream of water. In practice it frequently occurs that the requirements of use are satisfied after only a part of the charge of powder has been exhausted and if the unused powder has been maintained in dry condition it can-be saved for future use. This invention has for one of its objects to provide an improved apparatus so constructed and arranged that the powder is maintained in dry condition until it is actuall added to the stream for use. Another ObJGCt is to provide a positively acting means for adding the powder to the stream of water.

In the preferred embodiment the invention provldes an apparatus in which the powder can be mechanically forced into the stream while the flow of the water into the powder container is effectively prevented.

' The nature and objects of the invention will be better understood from a description of a particular illustrative embodiment for the purpose of which description reference should be had to the accompanying drawforming a part hereof and in which--- in s %igure 1 is a central sectional view of an apparatus embodying the invention taken on the line.1-1 of Fig. 2, and V Figure 2 is a central sectional view taken on the line 2-2 of Fig. 1.

The apparatus shown for the purposes of illustrating the invention comprises a positively acting wing pump like arrangement whereby powder can be fed from a hop er into a stream of water to be used for re fighting purposes.

casing so that thereis little if any leakage of water around the ends of the rotor. The rotor or pump like member also fits closely against the casing wall between the dis- HANSl anainnrs'rm, or nnnnm, GERMANY, ASSIGNOR ,TO rmnn mmimnx con charge outlet 7 and the powder inlet 8 so,

that no water is carried in the expanding pump chamber to the powder receiving position. The dry powder is thus fed without being substantially wet and without wetting the powder in the hopper. The pistons 11 make a substantially water tight closure against the side and circumferential walls of the casing. Radial movement isimparted to the pistons 11 by means of calm grooves 17 which are engaged by rollers 18 on thepistons.

It will be understood that the structure for positively forcing powder-from the hopper 9 into the stream of water. and if the apparatus is used to produce foam as is contemplated the foam will be passed out through the discharge outlet 7.

The pressure "of the water from the inlet 6 may be relied upon to rotate the rotor or if desired the rotor may be positively driven as lpy means of a motor connected to the shaft 2. I claim- 1. Apparatus for feeding dry foam-forming powder into a stream of water, comprising a'casin'g, a rotatable member within said casing forming a plurality of chambers of varying capacity, an inlet arranged to admit said powder to said chambers while the latter-are expendproducing fire foam by conventionally illustrated makes provision ing, a second inlet'to admit water to said chambers at a later stage while still expanding, and an outlet for the discharge of the mixed powder and water communicating with'said chambers while they are still expanded, substantially as described.

2. Apparatus for producing fire foam by 'feeding dry foam-forming powder into a stream. of water, com rising a casing, a positively actingfrotata 1e pump-like member mounted eccentrically in said casingand having grooved pistons movable radially therein and operative to provide within the casing a series of expanding pump chambers, an inlet to admit .dry powder to said expanding cham- I bers, and a second inlet thereafter to admit water to said chambers while they are still expanding, together with a discharge outlet for the combined powder and water, said out- 5 let being out of direct communication with both of said inlets and communicating with said chambers while they are at a point where they are expanded, substantially as described.

In testimony whereof, I have signed my name to this specification this 13th day of December 1929.

HANS BURMEISTER. 

